The study of animal emotion, as with its human equivalent, can be confusing due to the complicated and inconsistent use of terminology, and the number of interlinked fields and topics it encompasses. With this review, we aim to provide an up-to-date and, to the best of our knowledge, complete overview of the field of animal emotion, especially intended for new-comers to the field who wish to get a grasp of this field. We start by tackling the terminology and proposing definitions of commonly used terms, and present the different frameworks used for the study of animal emotion. Here, we heavily draw from human literature, as the definitions of animal emotion are derived originally from human research. We follow-up with an overview of current methodologies for the study of animal emotion, in particular the valence dimension of emotion, and include some of the associated limitations linked to these methodologies. We end by pointing out key areas for future research.

中文翻译：

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动物情感的基本要素。

由于对术语的使用复杂且前后不一致，并且涉及的领域和主题数量众多，因此对动物情感及其人类等效性的研究可能会造成混淆。通过这次审查，我们旨在提供最新信息，并据我们所知，全面概述动物情感领域，特别是针对希望对该领域有所了解的新手。 。我们首先处理术语并提出常用术语的定义，然后介绍用于动物情感研究的不同框架。在这里，我们大量借鉴人类文学，因为动物情感的定义最初源自人类研究。在后续工作中，我们对动物情感研究的当前方法进行了概述，特别是情感的效价维度，并包括与这些方法相关的一些相关限制。最后，我们指出了未来研究的关键领域。